@article{10_1155_S1048953304302017,
     author = {Agarwal, R.P. and O'Regan, Donal},
     title = {Essential -type maps and {Birkhoff{\textendash}Kellogg} theorems.},
     journal = {International Journal of Stochastic Analysis},
     pages = {1},
     publisher = {mathdoc},
     volume = {2004},
     number = {1},
     year = {2004},
     doi = {10.1155/S1048953304302017},
     zbl = {1084.47044},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.1155/S1048953304302017/}
}